Tire demounting device



T L m TIRE DEMQUNT ING DEVICE 5 Shee ts-Sheet 1 Filed Dec. 1, 1943 INVENTOR melam- @er April 15, 1947.

w. POLT TIRE, DEHOUNTING DEVICE Filed Dec. 1, 1943 5 Sheets-Sheet 2 R O T N E V m ORNE 5 I A nifi 15,1947. w, Po 2,418,849

'TIRE-jDEuotm'rme DEVICE Filed Dec. 1, 1943 5 she ts-shed 4 T fi' INVENTOR 'ZTTORNEZYZS A rifi as, 1947. 'w. POLT 2,418,849

I TIRE DEMQUNTING DEVICE Filed Dec. 1, 1943 5 Sheets-Sheet s INVENTOR W/LL/AM P047 Patented Apr. 15, 1947 2,418,849 rum DEMOUNTING mzvrcn William Polt, Freeport,N. Y., assignor, by mesne assignments, to E & G Machine and Tool Company, Freeport, N. Y., a partnership consisting of Nicholas Garis and Leo Egon-off, both of Huntington Station, and William Polt, Freeport,

Application December 1, 1943, Serial No. 512,410

2 Claims.

I This invention relates to tire demounting equipment and more especially'to equipment suitable for use in demounting airplane tires.

Equipment heretofore available for demounting tires from airplane wheels has been of such nature that the tires were subjected to such rough treatment during the demounting operation that very frequently the tires were not further usable. An object of this invention is equipment, by means of which the removal of an airplane tire from its wheel may be accomplished without injury to the tire. v I

Other objects, novel features and advantages of this invention will become apparent from the following specification and accompanying drawings, wherein:

Fig. 1 is an elevation of a stand forming part of the equipment embodying the invention;

Fig. 2 is a plan view thereof;

Fig.3 is a plan view of an element for use with the stand;

Fig. 4 is a perspective view illustrating the initial arrangement of the equipment for the removal of a tire;

. Fig. 5 is a section on the line 5-5 of --Fig. 4

illustrating an intermediate stage in the tire removal operation;

Fig. 6 is a perspective view illustrating the final stage of the removal of the tire;

Fig. '7 is an end elevation of a part used in the final stage;

Fig. 8 is a side elevation of said part; Fig. 9 is a plan view of said part; and Figs, 10 to 14 inclusive are sections substantially on the lines Ill-l0, ll-ll, l2-l2, l3|3,

and Ill-l4 of Fig. 8.

The equipment comprises a metal base I mounted on four legs II. A metal ring 12 is mounted on the upper face of the plate In and an annular cushion member l3 rests on the plate lll within the ring l2. A stud [4 extends up wardly from the plate in for some distance above the ring l2 and is arranged axially of the ring l2. Two slightly shorter studs are arranged on opposite sides of the stud l4. On the stud I4 is arranged a cone block l5 which projects slightly 2 coming up between the spokes and with the cone block 15 fitting into the inner bearing race of the wheel. A second cone block 15a is slipped over the stud it into the outer bearing race.

Next, a second metal ring 18 is placed on thetire. Both the rings l.- and I8 are of slightly larger interior diameter than the outer diameter of the wheel and the ring I8 is provided with cross members 19 having a central recess No. A hydraulic jack 20 or other suitable means is inter.- posed between the cross members l9 and the cross member H of the bail l6, and is actuated to press the ring l8, downwardly toward the ring l2.

Downward movement of the ring l8 causes downward movement of the upper bead of the tire in the wheel rim groove G relative to the wheel as well as downward movement of the wheel relative to the bottom bead to bring both beads into alinement with the well G in the wheel rim in which position the tire may be shifted laterally slightly with respect to the wheel, (Fig. 5). If the wheel breaks away from the lower bead first, the member l3 cushions the impact of it against the plate l0. When the ring :8 moves down the recess |9a is brought over the upper end of the stud M. The hydraulic jack and ring 18 arenow removed and the ball l6 lowered.

The wheel is now attached to the plate 10 by means of washers 2| arranged on the two studs Ma and held thereon by nuts 22. A collar 23 is slipped over the upper end of the stud l4 and is rotatably held thereon by a nut 24. The collar 23 is equipped with a yoke 25 having a pin 26 extending between the arms thereof. A handle 21 has at one end an aperture to receive the pin 26 to attach the handle thereto for pivotal movement. A sleeve 28 is slidably mounted on the handle 21 and is equipped with a plow member 29.

After mounting the various devices just described, the upper bead of the tire is pried up over the wheel rim at one spot by means of a standard tire tool 30 (Fig. 6) and the bead is held in spaced relation to the side of the wheel while the handle '21 (unattached to the collar 23) and sleeve 28 are properly manipulated to insert the plow member 29 betweenthe bead and the wheel rim. After the plow member has been inserted, the inner end of the handle 21 is placed in the yoke 25 and the pin 26 is passed through the holes in the yoke arms and the handle. Then with the tire tool 30 retained between the rim and a 3 stud ll as an axis. This operation of the handle 21 drags the plow member 29 along the wheel rim and progressively turns the tire bead up over it above the face of the wheel. 'As the plow member advances the tire tool 30 prevents return intothe wheel groove of the tire bead. After comprises a blade 3| of substantially rectangular configuration in elevation and partially overlies the outer periphery of the wheel W. The blade 3| is of generally arcuate contour of greater radius than the wheel periphery so that as shown in Fig. 9, with the leading edge 32 of the blade engaging the outer wheel periphery, the trailing edge33 of the blade is spaced from the outer wheel periphery and is more distant from the axis of the stud i4 than is the leading edge. The blade 3| curves outwardly as shown in Fig. 7 so that the edge 34 opposite the sleeve is further removed from the axis of the stud than is the edge adjacent the sleeve 28, which edge terminates in a lip 35 riding on the face of the wheel W. As the plow member moves along the rim of the wheel, the blade engages the bead and turns the latter up over the remainder of the plow member and the lip 35 above the face of the wheel. By reason of the trailing edge 33 belngspaced from the wheel periphery, the tire bead, once it has ber has been inserted, the handle is manipulated to locate the collar 23 around the stud i4 and the nut 24 screwed on to the stud. The handle 27 is then swung around the stud as an axis as previously described to turn the tire bead by having the plow above the face of the wheel.

It is of course understood that various modifications may be made in the device above described without in any way departing from the spirit of the invention as defined in the appended claims.

I claim:

1. A device of the character described compris ing means for supporting a first member for spoke-like rotation about the axis of a wheel having a peripheral groove for, receiving a tire, a plow member carried by said first member in overlying relation to the wheel outer periphery and comprising a substantially rectangular blade 1 having a leading edge engageable with the wheel outer periphery and a trailing edge spaced from the wheel outer periphery and having at one remaining edge a lip engaging the face of the wheel and having its fourth edge i'urther removed from the wheel axis than the remainder of said blade.

2. A device of the character described comprising a base having a stud for supporting a wheel having a peripheral groove receiving a tire, a collar rotatably supported by said stud, a handle attached to said collar, a sleeve slidably mounted on said handle, a plow member constituting a continuation of said sleeve and comprising a substantially rectangular blade having a leading edge engageable with the wheel outer periphery and a trailing edge spaced from the wheel outer periphery and having at one remaining edge a lip engaging the face of the wheel and having its fourth edge further removed from the wheel axis than the remainder of said blade.

' WILLIAM POLT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Bazarek May 28, 1940 

